Waste heat recovery heat exchange structure of metal powder sintering furnace

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a waste heat recovery heat exchange structure of a metal powder sintering furnace, which comprises a heat energy extraction box arranged in a sintering furnace body and an air inlet pipeline communicated with the sintering furnace body, one side of the heat energy extraction box is fixedly connected with a water inlet pipeline, and the water inlet pipeline is connected with an external water source. The top of the heat energy extraction box is fixedly connected with an exhaust pipeline, and the exhaust pipeline is used for exhausting water vapor; the exhaust pipeline comprises a conversion pipeline; the heat energy extraction box is arranged in the sintering furnace, redundant heat in high temperature generated when the sintering furnace works is absorbed and discharged through water vapor, on one hand, gas entering the sintering furnace is heated, on the other hand, heat energy is converted into mechanical energy, then the mechanical energy is converted into electric energy, and a part of the electric energy is stored; and the other part is provided for the structure to maintain the step of converting heat energy into mechanical energy, all the recycled energy can be used for work of the sintering furnace body, and the recycling rate is high.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and specifically to a waste heat recovery heat exchange structure for a metal powder sintering furnace. Background Technology

[0002] A sintering furnace is a specialized piece of equipment that densifies materials at high temperatures. Metal powder sintering furnaces differ from ordinary sintering furnaces. They require high-quality furnace body sealing structures and materials, precise control and switching of various gases, a dedicated waste heat zone, and an advanced heating element layout. While sintering furnaces generate high temperatures during operation, which initiate the sintering of metal powders, a significant amount of heat energy is consumed, failing to support the sintering process. To reduce energy consumption and recover energy, this heat energy is recycled and reused.

[0003] Currently, in the existing technology, a search reveals Chinese patent application number 202122460906.X, which discloses a vacuum sintering furnace with exhaust gas purification function. The furnace includes a base plate, a sintering furnace fixedly connected to the top left side of the base plate, a top plate fixedly connected to the top of the sintering furnace, and a heat-insulating water tank fixedly connected to the top of the top plate. A connecting air duct is connected to the rear side of the heat-insulating water tank, and the side of the connecting air duct away from the heat-insulating water tank is connected to the exhaust pipe of the sintering furnace. A heating pipe is fixedly connected to the inner cavity of the heat-insulating water tank.

[0004] The above scheme has the following shortcomings: it recovers waste heat from the exhaust gas discharged from the sintering furnace and uses the recovered heat to provide hot water for domestic use. However, the field of energy utilization is unrelated to the sintering furnace itself, resulting in a low recovery rate.

[0005] The purpose of this invention is to solve the problems mentioned above. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a waste heat recovery heat exchange structure for a metal powder sintering furnace, which can effectively solve the existing problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a waste heat recovery heat exchange structure for a metal powder sintering furnace, comprising a heat extraction box disposed inside the furnace body and an air inlet pipe communicating with the furnace body. A water inlet pipe is fixedly connected to one side of the heat extraction box and connected to an external water source. An exhaust pipe is fixedly connected to the top of the heat extraction box for discharging water vapor. The exhaust pipe includes a conversion pipe, which is U-shaped. An energy conversion component is slidably connected inside the vertical section of the conversion pipe near the furnace body. The energy conversion component includes an energy conversion... The system comprises two energy conversion mechanisms: Energy Conversion Mechanism 1, which converts thermal energy into mechanical energy, and Energy Conversion Mechanism 2, which converts mechanical energy into electrical energy. Energy Conversion Mechanism 1 includes a movable base rod slidably connected inside the vertical section of a conversion pipeline near the sintering furnace body. An electric valve is installed in the lower horizontal section of the conversion pipeline. When the electric valve is closed, water vapor is discharged from the upper horizontal section of the conversion pipeline, causing the movable base rod to move upward. When the electric valve is opened, water vapor is discharged from the lower horizontal section of the conversion pipeline, causing the movable base rod to move downward.

[0008] Furthermore, the exhaust pipe also includes a heat exchange tube, which is spiral in shape; the heat exchange tube surrounds the outside of the intake pipe and is used to transfer the heat of water vapor to the intake pipe.

[0009] Furthermore, a mounting base is fixedly connected to the top of the movable base rod. The mounting base is located outside the exhaust pipe. A steering linkage is connected to one side of the mounting base via a rotating shaft. A cavity is provided inside the steering linkage.

[0010] Furthermore, the second energy conversion mechanism includes a receiving link slidably connected inside the cavity of the steering link, a universal joint rotatably connected to one side of the receiving link, a rotating disk rotatably connected to one side of the universal joint, and a rotor fixedly connected to the center of the rotating disk.

[0011] Furthermore, a limiting rod is provided inside the cavity of the steering link, and limiting grooves are machined on both sides of the receiving link, with the limiting grooves and the limiting rod fitting together.

[0012] Furthermore, a circular baffle is fixedly connected to the bottom of the vertical section of the conversion pipe near the sintering furnace body; the inner diameter of the circular baffle is smaller than the diameter of the movable base rod.

[0013] Furthermore, a transmitter is provided at the bottom of the movable base rod, and receivers are provided at both the upper and lower nodes of the vertical section of the conversion pipe on the side near the sintering furnace body. When the transmitter moves to the same horizontal plane as the receiver and makes contact, the receiver receives the signal. When the lower receiver receives the signal, the electric valve closes; when the upper receiver receives the signal, the electric valve opens.

[0014] Furthermore, a magnet is provided at the bottom of the movable base rod, and an electromagnet is provided in the circular baffle; When the movable base rod moves downward, the electromagnet in the circular baffle is energized to accelerate the downward movement of the movable base rod.

[0015] Beneficial effects The technical solution provided by this invention has the following advantages compared with known public technologies: By setting up a heat extraction box inside the sintering furnace, excess heat generated at high temperatures during sintering furnace operation is absorbed and discharged through steam. This process heats the gas entering the sintering furnace and converts thermal energy into mechanical energy. Then, it converts thermal energy into electrical energy, storing a portion of the energy and supplying the rest to the structure to maintain the process of converting thermal energy into mechanical energy. All the recovered energy can be used for the operation of the sintering furnace body, resulting in a high recycling rate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the waste heat recovery and heat exchange structure of the metal powder sintering furnace of the present invention. Figure 2 This is a schematic diagram of the internal structure of the waste heat recovery and heat exchange structure of the metal powder sintering furnace of the present invention. Figure 3 This is a schematic diagram of the internal exploded structure of the waste heat recovery and heat exchange structure of the metal powder sintering furnace of the present invention. Figure 4 This is a schematic cross-sectional view of the exhaust pipe structure of the waste heat recovery heat exchange structure of the metal powder sintering furnace of the present invention. Figure 5 for Figure 4 A magnified structural diagram of part A; Figure 6 This is a schematic diagram of the energy conversion mechanism of the waste heat recovery and heat exchange structure of the metal powder sintering furnace of the present invention. Figure 7 This is a schematic diagram of the second energy conversion mechanism of the waste heat recovery heat exchange structure of the metal powder sintering furnace of the present invention.

[0018] Figure Labels 1-Sintering furnace body; 2-Inlet pipe; 3-Exhaust pipe; 31-Conversion pipe; 32-Heat exchange tube; 33-Electric valve; 34-Circular baffle; 4-Heat extraction box; 5-Water inlet pipe; 6-Energy conversion component; 61-Moving base rod; 62-Steering linkage; 63-Limiting rod; 64-Receiving linkage; 65-Limiting groove; 66-Universal joint; 67-Rotating disc. Detailed Implementation

[0019] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0020] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0021] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] The present invention will be further described below with reference to embodiments.

[0025] Example: A waste heat recovery heat exchange structure for a metal powder sintering furnace, such as Figure 1-7 As shown, The system includes a heat extraction box 4 installed inside the sintering furnace body 1 and an air inlet pipe 2 connected to the sintering furnace body 1. The heat extraction box 4 is installed inside the sintering furnace body 1 to absorb excess heat generated during the operation of the sintering furnace body 1, thereby extracting the heat energy. The heat extraction box 4 has two pipes connected to the outside: one is a water inlet pipe 5, which is used to introduce the heat-absorbing medium, preferably water, into the heat extraction box 4; the other is an exhaust pipe 3, which transfers the heat energy out through water vapor. Specifically, the water inlet pipe 5 is fixedly connected to one side of the heat extraction box 4 and is connected to an external water source. The exhaust pipe 3 is fixedly connected to the top of the heat extraction box 4 and is used to discharge water vapor. The exhaust pipe 3 includes a conversion pipe 31 and a heat exchange pipe 32. The conversion pipe 31 is U-shaped, and an energy conversion component 6 is slidably connected inside the vertical section of the conversion pipe 31 near the sintering furnace body 1. It is worth noting that the U-shaped conversion pipe 31 is to facilitate the sliding of the energy conversion component 6 inside the conversion pipe 31 by water vapor. It can be understood that when water vapor is connected in the lower horizontal section of the conversion pipe 31, the energy conversion component 6 moves downward, and when water vapor is connected in the upper section of the conversion pipe 31, the energy conversion component 6 moves downward. When the flow is in the horizontal section, the energy conversion component 6 moves upward; the heat exchange tube 32 is spiral and surrounds the outside of the air inlet pipe 2, and is used to transfer heat to the air inlet pipe 2. It is worth noting that the air inlet pipe 2 is a pipe for filling gas into the sintering furnace body 1. By heating the air inlet pipe 2, the filling gas is heated before entering the sintering furnace body 1, reducing the temperature fluctuation range inside the sintering furnace body 1, so that part of the recovered heat energy can be used immediately in the operation of the sintering furnace body 1, improving the work quality. The energy conversion component 6 includes an energy conversion mechanism one and an energy conversion mechanism two. The energy conversion mechanism one is used to convert thermal energy into mechanical energy, and the energy conversion mechanism two is used to convert mechanical energy into electrical energy. Specifically, the energy conversion mechanism one includes a movable base rod 61 slidably connected to the interior of the vertical section of the conversion pipe 31 near the sintering furnace body 1. A mounting seat is fixedly connected to the top of the movable base rod 61, and the mounting seat is located outside the exhaust pipe 3. A steering linkage 62 is connected to one side of the mounting seat via a rotating shaft. A cavity is provided inside the steering linkage 62. The energy conversion mechanism two includes a receiving linkage 64 slidably connected to the interior of the cavity of the steering linkage 62. A universal joint 66 is rotatably connected to one side of the receiving linkage 64, and a rotating disk 67 is rotatably connected to one side of the universal joint 66. A rotor is fixedly connected to the center of the rotating disk 67. It is worth noting that when the rotating disk 67 rotates with the rotor, the rotor and stator are matched... The process involves combining and generating electricity, then storing the generated electrical energy to achieve the conversion of mechanical energy into electrical energy. Since the rotor and stator are existing technologies for generators, they are not shown in the accompanying drawings and will not be elaborated upon here. It should be noted that when water vapor flows inside the conversion pipe 31, the movable base rod 61 moves up and down within the conversion pipe 31. Each up-and-down movement of the movable base rod 61 corresponds to one rotation of the rotating disk 67. This can be understood as the steering linkage 62 rotating during the up-and-down movement of the movable base rod 61, which in turn causes the receiving linkage 64 to slide, ultimately causing the rotating disk 67 to rotate—that is, the rotor rotates—creating a cutting magnetic field line that generates electricity. To ensure the stability of the connection between the receiving linkage 64 and the steering linkage 62, a limiting rod 63 is provided inside the cavity of the steering linkage 62, and limiting grooves 65 are machined on both sides of the receiving linkage 64. The limiting grooves 65 and the limiting rod 63 fit together.

[0026] Furthermore, to ensure that the movable base rod 61 can move up and down in the conversion pipe 31 under the action of steam, an electric valve 33 is provided in the lower horizontal section of the conversion pipe 31. When the electric valve 33 is closed, steam is discharged from the upper horizontal section of the conversion pipe 31, so that the movable base rod 61 moves upward. When the electric valve 33 is open, steam is discharged from the lower horizontal section of the conversion pipe 31, so that the movable base rod 61 moves downward. The up and down movement of the movable base rod 61 is the conversion of thermal energy into mechanical energy. In order to prevent the movable base rod 61 from falling into the lower horizontal section of the conversion pipe 31 and affecting the discharge of steam, a circular baffle 34 is fixedly connected to the bottom of the vertical section of the conversion pipe 31 near the sintering furnace body 1. The inner diameter of the circular baffle 34 is smaller than the diameter of the movable base rod 61. Furthermore, the opening and closing of the electric valve 33 is a directional switch for the up-and-down movement of the moving base rod 61. To ensure the continuity of the up-and-down movement of the moving base rod 61, the electric valve 33 is powered by electrical energy generated by the energy conversion mechanism two. The following scheme is preferred in this invention: Option 1: The circuit of the electric valve 33 is designed as a delayed flip circuit. When the moving base rod 61 just begins to move upward and generate electrical energy, the electric valve 33 is in the closed state. At this time, the water vapor pushes the moving base rod 61 upward. When the moving base rod 61 moves to the highest point, that is, when the set time is reached, the electric valve 33 switches to the open state. At this time, the water vapor is discharged from the lower channel of the conversion pipe 31. The moving base rod 61 loses its power and moves downward under its own gravity. When it moves to the lowest point, that is, when the set time is reached again, the electric valve 33 switches to the closed state. The above situation is repeated, thus ensuring the continuity of the up and down movement of the moving base rod 61. Option 2: A transmitter is installed at the bottom of the movable base rod 61, and receivers are installed at the upper and lower nodes of the vertical section of the conversion pipe 31 near the sintering furnace body 1. When the transmitter moves to the same horizontal plane as the receiver and makes contact, it receives a signal. That is, when the lower receiver receives the signal, the electric valve 33 closes, water vapor is discharged from the upper horizontal section of the conversion pipe 31, and the movable base rod 61 moves upward. When the upper receiver receives the signal, the electric valve 33 opens, water vapor is discharged from the lower horizontal section of the conversion pipe 31, and the movable base rod 61 moves downward, thus ensuring the continuity of the up and down movement of the movable base rod 61.

[0027] Furthermore, under normal circumstances, the thrust of water vapor driving the movable base rod 61 is much greater than the weight of the energy conversion component 6. Therefore, the time for the movable base rod 61 to move upward is less than the time for it to move downward. In order to ensure the stability of electrical energy generation, that is, to ensure that the time for the movable base rod 61 to move upward and downward is not much different, so that the speed of the rotating disk 67 does not change much, the present invention preferably adopts the following scheme: Option 1: Install an electric push rod above the mounting base at the top of the movable base rod 61. When the movable base rod 61 moves downward, drive the electric push rod to increase the thrust on the mounting base at the top of the movable base rod 61, so as to speed up the downward movement of the movable base rod 61. Make the downward movement time of the movable base rod 61 equal to the upward movement time of the movable base rod 61, so as to ensure the equivalence of the vertical movement of the movable base rod 61. Option 2: A magnet is installed at the bottom of the movable base rod 61, and an electromagnet is installed in the circular baffle 34. When the movable base rod 61 moves downward, the electromagnet in the circular baffle 34 is energized, thereby increasing the attraction force during the downward movement of the movable base rod 61, so as to speed up the downward movement of the movable base rod 61. By making the downward movement time of the movable base rod 61 equal to the upward movement time of the movable base rod 61, the equivalence of the up and down movement of the movable base rod 61 can be guaranteed.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery heat exchange structure for a metal powder sintering furnace, characterized in that it includes a heat energy extraction box (4) arranged inside the sintering furnace body (1) and an intake pipeline (2) connected to the sintering furnace body (1). One side of the heat energy extraction box (4) is fixedly connected with a water inlet pipeline (5), and the water inlet pipeline (5) is connected to an external water source. The top of the heat energy extraction box (4) is fixedly connected with an exhaust pipeline (3), and the exhaust pipeline (3) is used to discharge water vapor; The exhaust pipeline (3) includes a conversion pipeline (31), and the shape of the conversion pipeline (31) is "mouth" shaped. An energy conversion component (6) is slidably connected inside the vertical section of the conversion pipeline (31) close to the sintering furnace body (1); The energy conversion component (6) includes an energy conversion mechanism one and an energy conversion mechanism two. The energy conversion mechanism one is used to convert heat energy into mechanical energy, and the energy conversion mechanism two is used to convert mechanical energy into electrical energy; The energy conversion mechanism one includes a moving base rod (61) slidably connected inside the vertical section of the conversion pipeline (31) close to the sintering furnace body (1); An electric valve (33) is arranged in the horizontal section below the conversion pipeline (31). When the electric valve (33) is closed, water vapor is discharged from the upper horizontal section of the conversion pipeline (31) to make the moving base rod (61) move upward. When the electric valve (33) is opened, water vapor is discharged from the lower horizontal section of the conversion pipeline (31) to make the moving base rod (61) move downward.

2. The waste heat recovery heat exchange structure for a metal powder sintering furnace according to claim 1, characterized in that the exhaust pipeline (3) further includes a heat exchange tube (32), and the heat exchange tube (32) is spiral; The heat exchange tube (32) surrounds the outside of the intake pipeline (2) and is used to transfer the heat of the water vapor to the intake pipeline (2).

3. The waste heat recovery heat exchange structure for a metal powder sintering furnace according to claim 1, characterized in that a mounting seat is fixedly connected to the top of the moving base rod (61), and the mounting seat is located outside the exhaust pipeline (3). One side of the mounting seat is connected with a steering connecting rod (62) through a rotating shaft, and a cavity is arranged inside the steering connecting rod (62).

4. The waste heat recovery heat exchange structure for a metal powder sintering furnace according to claim 3, characterized in that the energy conversion mechanism two includes a receiving connecting rod (64) slidably connected inside the cavity of the steering connecting rod (62). One side of the receiving connecting rod (64) is rotatably connected with a universal joint (66), and one side of the universal joint (66) is rotatably connected with a rotating disc (67). A rotor is fixedly connected to the center of the rotating disc (67).

5. The waste heat recovery heat exchange structure for a metal powder sintering furnace according to claim 4, characterized in that a limiting rod (63) is arranged inside the cavity of the steering connecting rod (62). Limiting grooves (65) are processed on both sides of the receiving connecting rod (64), and the limiting grooves (65) are mutually fitted with the limiting rod (63).

6. The waste heat recovery and heat exchange structure for a metal powder sintering furnace according to claim 5, characterized in that, A circular baffle (34) is fixedly connected to the bottom of the vertical section of the conversion pipe (31) near the sintering furnace body (1). The inner diameter of the circular baffle (34) is smaller than the diameter of the movable base rod (61).

7. The waste heat recovery and heat exchange structure for a metal powder sintering furnace according to claim 6, characterized in that, The bottom of the movable base rod (61) is provided with a transmitter, and a receiver is provided at the upper and lower nodes of the vertical section of the conversion pipe (31) on the side close to the sintering furnace body (1). When the transmitter moves to the same horizontal plane as the receiver and makes contact, the receiver receives the signal. When the lower receiver receives a signal, the electric valve (33) closes; when the upper receiver receives a signal, the electric valve (33) opens.

8. The waste heat recovery and heat exchange structure for a metal powder sintering furnace according to claim 7, characterized in that, A magnet is provided at the bottom of the movable base rod (61), and an electromagnet is provided in the circular baffle (34); When the movable base rod (61) moves downward, the electromagnet in the circular baffle (34) is energized to accelerate the downward movement of the movable base rod (61).

Images